Comparing High And Low Energy Outcomes On First Follow Up Day For Smartsight Myopic-Astigmatism Treatments With The Schwind Atos: A Retrospective Case Series

Comparing high and low energy outcomes on the first follow-up for SmartSight myopic-astigmatism treatments with the SCHWIND ATOS: a retrospective case series

Impact of low energy asymmetric spacings vs. high energy symmetric spacings on the immediate/early (postoperative day 4 (POD4)) outcomes of SmartSight lenticule extraction for myopic astigmatism with a new femtosecond laser system.

The first 102 eyes of 51 patients consecutively treated using low energy asymmetric spacings (Group A; Study group) were compared at POD 4 to the last 102 eyes of 51 patients consecutively treated using high energy symmetric spacings (Group B; Controls). Mean age of the patients was 23.2 ± 4.5 years with a mean spherical equivalent of -4.59 ± 1.38 diopters (D) and a mean magnitude of refractive astigmatism of 1.21 ± 0.93 D.

Laser Energy was -15 ± 1nJ lower for asymmetric treatments (p < .0001); Spot and Track distances were + 0.6 ± 0.1 µm larger and -0.5 ± 0.1 µm tighter for asymmetric treatments, respectively (p < .0001 for both). At POD4, astigmatism was -0.28 ± 0.02D lower for asymmetric treatments (p < .0003); uncorrected and corrected visual acuities (UDVA and CDVA, respectively) were -0.13 ± 0.04logMAR better for asymmetric treatments (p < .0007); differences between postop UDVA and preop CDVA along with change in CDVA were + 0.45 ± 0.1lines better for asymmetric treatments (p < .0003).

Lenticule extraction treatment using SmartSight is safe and efficacious already at POD 4. Findings suggest that low energy asymmetric spacings may further improve the immediate and short-term outcomes of SmartSight lenticule extraction in the treatment of myopic astigmatism compared to conventional settings (high energy symmetric spacings).